Center gauge

Two different thread setting gauges

Center gauges and fishtail gauges are gauges used in lathe work for checking the angles when grinding the profiles of single-point screw-cutting tool bits and centers. In the image, the gauge on the left is called a fishtail gauge or center gauge, and the one on the right is another style of center gauge.

These gauges are most commonly used when hand-grinding threading tool bits on a bench grinder, although they may be used with tool and cutter grinders. When the tool bit has been ground to the correct angle, they may then be used to set the tool perpendicular to the workpiece.

They can incorporate a range of sizes and types on the one gauge, the two most common being metric or UNS at 60°, and BSW at 55°. Gauges also exist for the Acme thread form.

Metalworking

Tools
Cutting machines	Bandsaw Cold saw Laser Miter saw Plasma Water jet cutter
Cutting tools	Broach Burr Chisel Counterbore Countersink End mill File Hand scraper Milling cutter Nibbler Reamer Shears Tipped tool Tool bit
Forming tools	Brake Die English wheel Hydraulic press Machine press Punch press Screw press Stamping press
Hand tools	Clamp Combination square Drift pin Hacksaw Hammer Hand scraper Machinist square Needlegun scaler Piercing saw Pliers Punch Scriber Tap and die Tongs Vise Workbench Wrench
Machine tooling	Angle plate Chuck Collet Fixture Indexing head Jig Lathe center Machine taper Magnetic base Mandrel Rotary table Wiggler
Measuring instruments	Bore gauge Caliper Center gauge Dial indicator Engineer's blue Engineer's spirit level Feeler gauge Gauge Gauge block Go/no go gauge Height gauge Machinist square Marking blue Marking gauge Marking out Micrometer Optical comparator Radius gauge Ruler Sine bar Straightedge Surface plate Tape measure Thread pitch gauge Vernier scale
Smithing tools	Anvil Forge Fuller Hardy tools Pritchel Steam hammer Swage block Trip hammer

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